小卫星火卫二
(原标题: Small Moon Deimos)
2024-09-07
浏览次数: 14
火星有两个小卫星，火卫一和火卫二，以希腊神话中的恐惧和恐慌的名字命名。这两幅图都显示了较小的卫星火卫二的详细表面视图。这些图像是2009年由火星勘测轨道飞行器上的HiRISE相机拍摄的，火星勘测轨道飞行器是美国宇航局长寿的行星际互联网卫星。火卫二是火星两颗卫星中最外层的一颗，是太阳系中已知最小的卫星之一，直径只有15公里左右。1877年，在华盛顿美国海军天文台工作的美国天文学家阿萨弗·霍尔发现了这两颗火星卫星。但它们的存在是在1610年左右由推导出行星运动定律的天文学家约翰内斯·开普勒提出的。在这种情况下，开普勒的预测并不是基于科学原理，但他的作品和想法是如此有影响力，以至于在乔纳森·斯威夫特的小说作品中讨论了火星的两颗卫星，这两颗卫星写于1726年，比它们被发现早了150多年。
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Mars has two tiny moons, Phobos and Deimos, named for the figures in Greek mythology Fear and Panic. Detailed surface views of smaller moon Deimos are shown in both these panels. The images were taken in 2009, by the HiRISE camera on board the Mars Reconnaissance Orbiter spacecraft, NASA's long-lived interplanetary internet satellite. The outermost of the two Martian moons, Deimos is one of the smallest known moons in the Solar System, measuring only about 15 kilometers across. Both Martian moons were discovered in 1877 by Asaph Hall, an American astronomer working at the US Naval Observatory in Washington D.C. But their existence was postulated around 1610 by Johannes Kepler, the astronomer who derived the laws of planetary motion. In this case, Kepler's prediction was not based on scientific principles, but his writings and ideas were so influential that the two Martian moons are discussed in works of fiction such as Jonathan Swift's Gulliver's Travels, written in 1726, over 150 years before their discovery.